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NEET2016ZoologyNeural Control and CoordinationActual

Choose the correct statements.

Options

  1. ANociceptors respond to changes in pressure
  2. BMeissner's corpuscles are thermoreceptors
  3. CPhotoreceptors in the human eye are depolarised during darkness and become hyperpolarized in response to the l
  4. DReceptors do not produce graded potentials

Correct answer

C. Photoreceptors in the human eye are depolarised during darkness and become hyperpolarized in response to the l

Step-by-step solution

Mechanism of vision: In the dark photoreceptors release an inhibitory neurotransmitter that prevents the activation of ganglion cells by bipolar neurons. Light inhibits the photoreceptors from releasing the inhibitory transmitter. Without this inhibition, the bipolar neurons are able to stimulate the ganglion cells. The ganglion cells transmit action cortex analyses and compare the input with earlier stored experiences for understanding the input (image). The photoreceptors contain many Na + channels in their plasm

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